I've forked this plugin over at: https://github.com/hiddentao/wordpress-media-flickr
- Images inserted with center alignment are now given the correct 'aligncenter' class
- Flickr REST call URLs are now protocol-relative, so the plugin will now work within secure admin pages (https) too. Some users may have been seeing blank insertion windows due to this bug.
- Images now have their 'title' attribute set too.